<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>

        <table border="1" width="70%">
            <caption>标题</caption>

            <thead>
                <tr>
                    <th>序号</th>
                    <th>商品</th>
                    <th>价格</th>
                </tr>
            </thead>

            <tbody>
                <tr>
                    <td>1</td>
                    <td>aaa</td>
                    <td>99.0</td>
                </tr>

                <tr>
                    <td>2</td>
                    <td>bbb</td>
                    <td>40.0</td>
                </tr>

                <tr>
                    <td>3</td>
                    <td>ccc</td>
                    <td>20.0</td>
                </tr>

            </tbody>

            <tfoot>
                <tr>
                    <td>xxx</td>
                </tr>
            </tfoot>
        </table>



        <hr/>

        <table border="1" width="70%">

            <tr>
                <th>序号</th>
                <th>商品</th>
                <th>价格</th>
            </tr>

            <tr>
                <td>1</td>
                <td>aaa</td>
                <td>99.0</td>
            </tr>

            <tr>
                <td>2</td>
                <td>bbb</td>
                <td>40.0</td>
            </tr>

            <tr>
                <td>3</td>
                <td>ccc</td>
                <td>20.0</td>
            </tr>


        </table>


        <hr/>

        <table border="1" width="70%">

            <tr>
                <th>序号</th>
                <th>商品</th>
                <th>价格</th>
            </tr>

            <tr>
                <td>1</td>
                <td colspan="2">aaa</td>
            </tr>

            <tr>
                <td>2</td>
                <td>bbb</td>
                <td rowspan="2">40.0</td>
            </tr>

            <tr>
                <td>3</td>
                <td>ccc</td>
            </tr>


        </table>


        <hr/>

        <form action="#">
            <table>
                <tr>
                    <td>用户名：</td>
                    <td><input type="text"/></td>
                </tr>
                <tr>
                    <td>密码：</td>
                    <td><input type="password"/></td>
                </tr>
            </table>
        </form>

    </body>
</html>